铁道科学与工程学报2016，Vol.13Issue(12)：2341-2346,6.
温度作用下桥上C RTSⅡ型轨道离缝及变形分析
Analysis of gap and deformation of CRTSⅡtrack on bridges under temperature
摘要
Abstract
An entity CRTSⅡslab ballastless track structure on simply-supported beam bridges of high-speed railway finite element model (FEM)was established.In this model,the solid finite elements were used to simu-late track structure,the contact elements were applied to simulate the contact relationship between adjacent lay-ers,the compression bar elements were used to simulate the bridges and the nonlinear spring elements were ap-plied to simulate the pigeonhole type lateral blocks.The results of finite element and related literature case veri-fied each other.Research shows that:Overall heating has large effect on the longitudinal shearing stress between the interface of track slab and mortar.The stress rises as the temperature increases,but interface longitudinal shear failure will not occur within the normal operating range of the structure.Temperature gradient mainly influ-ences the vertical positive stress of the interface,it can lead to vertical tensile failure and then produce mortar open joint.The open joint appears at the edge of track slab,under the alternate effect of increases and decreases of temperature the open joint progresses along the horizontal depth which could reach as deep as 50 cm.When the bonding strength of the interface is 0.02 MPa,the positive and negative critical temperature gradient is 5.3℃and-4.8 ℃respectively for the appearance of mortar open joint.There is a linear relationship between temperature and strength,the critical temperature gradient becomes larger as the bonding strength grows.The fault in seam at the edge of track slabs causes tensile failure of interface in certain longitudinal range near the seam and transfixes along the transverse direction and finally result in mortar seam and upwarp at the end of track slab.Advancing the construction quality of mortar and enhancing the control of seam construction are beneficial to restrain mortar seam and upwarp deformation.关键词
高速铁路/简支梁/无砟轨道/砂浆离缝/有限元分析/温度梯度Key words
high-speed railway/simply-supported beam/ballastless track/mortar gap/finite element analysis分类
交通工程引用本文复制引用
周敏,戴公连,闫斌..温度作用下桥上C RTSⅡ型轨道离缝及变形分析[J].铁道科学与工程学报,2016,13(12):2341-2346,6.基金项目
国家自然科学基金资助项目（51478483）；高速铁路基础研究联合基金资助项目（U1334203）；中国铁路总公司科技研究开发计划课题 （）
